Rock, Paper, scissors, spock or lizards by schamanu

    alert("Welcome to Rock, Paper, Scissors, Lizard, Spock\n\t\t*Programmed by Schamanu*");

    /*Variables and game setup*/
    var played = 0;
    var score1 = 0;
    var score2 = 0;
    var times = Number(prompt("How often do you want to play?"));
    if (isNaN(times)) {
        times = 1;
        alert("\nInvalid input!\nNumber of rounds set to 1!");
    }
    else
    {
    alert("\nYou chose to play "+ times +" times.");

    /*FUNCTION COMPARING CHOICES*/
    var compare=function(choice1,choice2) {
        if (choice1===choice2) {
            alert("Its a tie. Choose again!");
        }
        else if (choice1==="rock") {
           if (choice2==="scissors") {
             alert("Rock crushes scissors.");
             alert("Player 1 wins this round.");
             score1+=1;
           }
           else if (choice2==="paper") {
             alert("Paper covers rock.");
             alert("The computer wins this round.");
             score2+=1;
           }
           else if (choice2==="spock") {
             alert("Spock vaporizes rock.");
             alert("The computer wins this round.");
             score2+=1;
           }
           else {  // choice2=lizard
             alert("Rock crushes lizard.");
             alert("Player 1 wins this round.");
             score1+=1;
           }
        }
        else if (choice1==="paper") {
           if (choice2==="rock") {
             alert("Paper covers rock.");
             alert("Player 1 wins this round.");
             score1+=1;
           }
           else if (choice2==="scissors") {
             alert("Scissors cut paper.");
             alert("The computer wins this round.");
             score2+=1;
           }
           else if (choice2==="spock") {
             alert("Paper disproves Spock.");
             alert("Player 1 wins this round.");
             score1+=1;
           }
           else { // choice2=lizard
             alert("Lizard eats paper.");
             alert("The computer wins this round.");
             score2+=1;
           }
        }
        else if (choice1==="scissors") {
           if (choice2==="rock") {
             alert("Rock crushes scissors.");
             alert("The computer wins this round.");
             score2+=1;
          }
          else if (choice2==="paper") {
             alert("Scissors cut paper.");
             alert("Player 1 wins this round.");
             score1+=1;
          }
          else if (choice2==="spock") {
             alert("Spock smashes scissors.");
             alert("The computer wins this round.");
             score2+=1;
          }
          else { // choice2=lizard
             alert("Scissors decapitate lizard.");
             alert("Player 1 wins this round.");
             score1+=1;
          }
        }
        else if (choice1==="spock") {
          if (choice2==="rock") {
             alert("Spock vaporizes rock.");
             alert("Player 1 wins this round.");
             score1+=1;
          }
          else if (choice2==="paper") {
             alert("Paper disproves Spock.");
             alert("The computer wins this round.");
             score2+=1;
          }
          else if (choice2==="scissors") {
             alert("Spock smashes scissors.");
             alert("Player 1 wins this round.");
             score1+=1;
          }
          else { // choice2=lizard
             alert("Lizard poisons Spock.");
             alert("The computer wins this round.");
             score2+=1;
          }
        }
        else if (choice1==="lizard") {
          if (choice2==="rock") {
             alert("Rock crushes lizard.");
             alert("The computer wins this round.");
             score2+=1;
          }
          else if (choice2==="paper") {
             alert("Lizard eats paper.");
             alert("Player 1 wins this round.");
             score1+=1;
          }
          else if (choice2==="scissors") {
             alert("Scissors decapitate lizard.");
             alert("The computer wins this round.");
             score2+=1;
          }
          else { // choice2=spock
             alert("Lizard poisons Spock.");
             alert("Player 1 wins this round.");
             score1+=1;
          }
        }
    };
    /*END OF FUNCTION*/

    do { // repeats game x times, as specified by player
        played += 1;
        do { // repeats code as long as game is tied
            do { // repeats code until player enters proper input
                if (userChoice==="rules") {
                    alert("\nRules:\nScissors cuts paper. Paper covers rock.");
                    alert("Rock crushes lizard. Lizard poisons Spock.\nSpock smashes scissors. Scissors decapitates lizard.");
                    alert("Lizard eats paper. Paper disproves Spock.\nSpock vaporizes rock. Rock crushes scissors.");
                }
                var userChoice = prompt("Do you choose rock, paper, scissors, lizard or spock?","Type <rules> to see the rules.").toLowerCase();
            } while (userChoice !="rock" && userChoice !="paper" && userChoice !="scissors" && userChoice !="spock" && userChoice !="lizard");
        var computerChoice = Math.random();
        if (computerChoice < 0.2) {
            computerChoice = "rock";
        } else if (computerChoice <= 0.4) {
            computerChoice = "paper";
        } else if (computerChoice <=0.6) {
            computerChoice = "scissors";
        } else if (computerChoice <=0.8) {
            computerChoice = "spock";
        }
        else {
            computerChoice = "lizard";
        }

        if (times >1) {
            alert("\nRound "+ played+"/"+times);
        }
        alert("\nYour choice: "+ userChoice);
        alert("Computer: " + computerChoice);

        compare(userChoice,computerChoice);
        } while (userChoice === computerChoice);
    } while (played <= times-1); // times minus 1 because its a do-loop

    if (times >1) {
        alert("\nFinal Score: "+ score1+":"+score2);
        if (score1>score2) {
            alert("Player 1 is the overall winner!");
        }
        else if (score2>score1) {
        alert("The computer is the overall winner!");
        }
        else {
            alert("It's a tie after all.");
        }
    }
    }